TY - JOUR AU - Chorfi, Nejmeddine AU - Jleli, Mohamed TI - Approximation of the singularity coefficients of an elliptic equation by mortar spectral element method JO - Electronic Journal of Differential Equations PY - 2015 VL - 2015 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/EJDE_2015__2015__a99/ LA - en ID - EJDE_2015__2015__a99 ER -